Implement PFN database initialization and memory descriptor processing

xtoskrnl/mm/pte.cc

@@ -104,6 +104,21 @@ MM::Pte::GetPtesPerPage(VOID)
     return MM_PAGE_SIZE / MM::Paging::GetPteSize();
 }
 
+/**
+ * Returns a pointer to the valid PTE.
+ *
+ * @return This routine returns a pointer to the valid PTE.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+PMMPTE
+MM::Pte::GetValidPte()
+{
+    /* Return a pointer to the valid PTE */
+    return &ValidPte;
+}
+
 /**
  * Formats a range of PTEs into a freelist-based pool for system allocations.
  *